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/* Formatted output to obstacks.
Copyright (C) 2008-2014 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <stdio.h>
#include "obstack.h"
#include "vasnprintf.h"
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
/* Grow an obstack with formatted output. Return the number of bytes
added to OBS. No trailing nul byte is added, and the object should
be closed with obstack_finish before use.
Upon memory allocation error, call obstack_alloc_failed_handler.
Upon other error, return -1. */
int
obstack_printf (struct obstack *obs, const char *format, ...)
{
va_list args;
int result;
va_start (args, format);
result = obstack_vprintf (obs, format, args);
va_end (args);
return result;
}
/* Grow an obstack with formatted output. Return the number of bytes
added to OBS. No trailing nul byte is added, and the object should
be closed with obstack_finish before use.
Upon memory allocation error, call obstack_alloc_failed_handler.
Upon other error, return -1. */
int
obstack_vprintf (struct obstack *obs, const char *format, va_list args)
{
/* If we are close to the end of the current obstack chunk, use a
stack-allocated buffer and copy, to reduce the likelihood of a
small-size malloc. Otherwise, print directly into the
obstack. */
enum { CUTOFF = 1024 };
char buf[CUTOFF];
char *base = obstack_next_free (obs);
size_t len = obstack_room (obs);
char *str;
if (len < CUTOFF)
{
base = buf;
len = CUTOFF;
}
str = vasnprintf (base, &len, format, args);
if (!str)
{
if (errno == ENOMEM)
obstack_alloc_failed_handler ();
return -1;
}
if (str == base && str != buf)
/* The output was already computed in place, but we need to
account for its size. */
obstack_blank_fast (obs, len);
else
{
/* The output exceeded available obstack space or we used buf;
copy the resulting string. */
obstack_grow (obs, str, len);
if (str != buf)
free (str);
}
return len;
}
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